This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1140/epjc/s10052-020-08620-5 in citations.
Please use the identifier: http://hdl.handle.net/2128/26226 in citations.
Deciphering the mechanism of near-threshold $$J/\psi $$ photoproduction
Deciphering the mechanism of near-threshold $$J/\psi $$ photoproduction
The photoproduction of the J/ψ off the proton is believed to deepen our understanding of various physics issues. On the one hand, it is proposed to provide access to the origin of the proton mass, based on the QCD multipole expansion. On the other hand, it can be employed in a study of pentaquark st...
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Personal Name(s): | Du, Meng-Lin |
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Baru, Vadim / Guo, Feng-Kun (Corresponding author) / Hanhart, Christoph / Meißner, Ulf-G. / Nefediev, Alexey / Strakovsky, Igor | |
Contributing Institute: |
Theorie der Starken Wechselwirkung; IAS-4 Theorie der starken Wechselwirkung; IKP-3 |
Published in: | The European physical journal / C, 80 (2020) 11, S. 1053 |
Imprint: |
Heidelberg
Springer
2020
|
DOI: |
10.1140/epjc/s10052-020-08620-5 |
Document Type: |
Journal Article |
Research Program: |
TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik Computational Science and Mathematical Methods |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/26226 in citations.
The photoproduction of the J/ψ off the proton is believed to deepen our understanding of various physics issues. On the one hand, it is proposed to provide access to the origin of the proton mass, based on the QCD multipole expansion. On the other hand, it can be employed in a study of pentaquark states. The process is usually assumed to proceed through vector-meson dominance, that is the photon couples to a J/ψ which rescatters with the proton to give the J/ψp final state. In this paper, we provide a compelling hint for and propose measurements necessary to confirm a novel production mechanism via the ΛcD¯(∗) intermediate states. In particular, there must be cusp structures at the ΛcD¯(∗) thresholds in the energy dependence of the J/ψ photoproduction cross section. The same mechanism also implies the J/ψ-nucleon scattering lengths of order 1 mfm. Given this, one expects only a minor contribution of charm quarks to the nucleon mass. |